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Патент USA US2122759

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July 5, 1938.
F. |_. SCOTT
2,122,759
DRILL CUTTER
Filed July 16, 1936
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Floyd L. .5202’?
INVENTOR
ATTORNEY
‘Patented July s, 1938
2,122,759
UNITED STATES
PATENT OFFICE
2,122,159
mum. CUTTER.
I Floyd L. Scott, Houston, Tex” assignor to Hughes
Tool Company, Houston, Tex., a corporation
of Texas
Application July 16, 1936, Serial No, 90,839
6 Claims. 401155-71)
My invention relates to drill cutters and has
particular application to the formation of the
teeth on the cutting periphery of the cutter.
In the type of well drill known as the cross roll
5 er drill ‘it is desirable to arrange the cutters so
that the teeth will cut the full bottom of the
hole. Where the teeth are formed in a regular
manner on the cutting elements the teeth on the '
cutters tend to track upon the well,bottom so
10 that the teeth fall within imprints already made
by the same or other cutters.
When this occurs '
the teeth do not efficiently disintegrate the mate
rial on which the drill is operating and speed can
not be maintained. In attempting to overcome
15 this difliculty it is customary to form the teeth
spirally around the cutters, but even this expedi
ent does not entirely overcome the tendency of
the teeth to track in-prints already made due to
the regularity of the spiral.
20
It is an object of my invention to
teeth on the cutters so that they will
in the prints of teeth previously out
well bottom, but will cut irregularly
form the
not track
upon‘ the
and thus
cover the whole area of the well bottom more
25 eifectively.
‘
I contemplate forming the teeth in lines‘run
ningin zig-zag direction about the cutting pe
riphery of each cutter and-to position the crest
of each adjacent tooth so that it points in a
30 direction different from that of the one preceding
or the one following the same.
'
By so forming the teeth I have as an object‘to
obtain tracks upon the well bottom in which the
line out by the crest of one toothywill be crossed -
35 by the line out by the crest of the next tooth
to cut at that point.
I
leg. The bridge 5 is ?attened between its ends
and has an opening to allow the cross roller shaft
to extend therethrough. At its ends it is up
wardly inclined and cutter shafts 8 are formed
thereon. Said shafts are welded to the legs 3
by welding material 9.
The side cutters I0 are mounted on the shafts
8 and are-inclined upwardly and inwardly in the
usual manner. The cutting teeth II upon the
side cutters are cut at an angle to the axis there- 10
of, the teeth on one set being cut at an angle
inclined outwardly and forwardly in the direction
of rotation and the teeth on the other cutter are
angled to incline the crests outwardly and rear
wardly.
My invention has particular. application to the
cross roller cutters l2 and I3.
As will be seen
from the drawing, the cutter I2 is shorter than
the cutter iii. The cutter- I3 thus extends past
the center of the drill and acts to cover the full 20‘
bottom of the hole in its rotation.v Each cutter
tapers slightly away from its outer end.
The teeth It, upon each cutter, are arranged
in rows longitudinally of the cutter, but said rows
are arranged at an angle to the longitudinal axis 25
of the cutter. The troughs or grooves between
the rows are designated by the numeral IS. The
teeth extend in zig-zag lines about the circum
ference of the cutters. To show this feature
clearly Figs. 4 and 5 have been made. Each of 30
these views are developments of the complete
surface of the cutter. The'cutting surface may
be imagined as removed and spread out.
.
dicate the circumferential rows. As will be seen 35
the row is in a wavy or zig-zag line. This will
Referring to the drawing herewith, Fig. 1 is a
avoid any tendency of the teeth to track in the
' central vertical section through the lower end
of a drill embodying the invention.
.
imprints cut by preceding teeth. Also it will be
40
Fig. 2 is a bottom plan view of said drill.
I
Fig. 3 is a broken elevation of a drill head with
certain parts in section.
~
Figs. 4 and 5 are developments of the cutting
surface of a cutter embodying the invention,
45 each ?gure illustrating a di?erent embodiment.
Fig. 6 is a side elevation vof the Fig. 5; type of
cutter.
.
The drill illustrated is a cross roller drlllhav
ing a head I, with two‘pairs of forwardly‘pro
50 jecting legs 2 and 3. The opposed pair of legs
2 supportthe cross roller shaft 4 while the legs
I3 support the bridge 5. As will be seen from
Fig. 1, the cross roller shaft I is secured through
washers 6 tow the legs 2 by a bond of welding ma
terlal 'l which is welded into an opening in each
.
With reference to Fig. 4, the dotted lines 16 in
seen that they are formed with chisel shaped
crests l1 and that the crest of the teeth in one 40
longitudinal row are set at an angle to the cut
ter axis which is different from the angle of the
tooth crest upon the teeth in the longitudinal
row preceding. Thus it will be understood that
if, by chance, the teeth on a cutter would track 45
in‘ a preceding imprint already made on the well
bottom the cut'made would not ?t therein, but
would cross the same and thus tend to disinte
gratefthe formation encountered.
In the» embodiment shown in Fig. 5 the crests 50
I8 of the 'teeth are arranged at an angle to the
zig-zag lines about the circumference of the cut
ter which cuts said line more nearly perpendicu
lar thereto. The crests of the teeth instead of
running about the circumference of the cutter
2 t
2,122,75o
_run longitudinally of the cutter. This type of
nally of the cutter and also in rows
tooth has better traction on the bottom of the
direction around the circumference
hole due to the position of the cutter cress, as ter,
the crests of the teeth in one
will be seen in Fig. 6.
row being inclined relative toithe
Teeth thus formed and positioned on the pe
cutter in a direction different from
riphery of a drill cutter are found to cut the teeth
in rows adjacent thereto.
well bottom-more rapidly because of the manner
in which they contact the material and cut away
the same.
Each tooth cuts a track' different
10 from other teeth and the whole of the well bot
tom is eifectively engaged by the teeth. Thus
without the addition of extra weight upon the
drill a cutting and penetrating action of the
teeth is obtained in the most effective manner
15 and a maximum of drilling speed is obtained.
“What I claim as new is: ,
'
1. 1/1 drill cutter mounted to roll upon the well
bottom, teeth formed on the outer periphery
thereof, said teeth being chisel-shaped with cut
_20 ting crests thereon and formed in rows longi
tudinally of the cutter and also in rows in a zig
zag direction around the circumference of the
cutter and troughs between said circumferential
rows.
25
'
>
'
2. A drill cutter mounted to roll upon the well
.bottom,7 teeth formed
on the outer periphery
thereof, said teeth being chisel-shaped with cut
ting crests thereon and formed in rowsjlongitudi
nally of the cutter and also in rows in a‘zig-zag di- '
rection around the circumference of the cutter,
said circumferential rows-having troughs between
them, said longitudinal rows being inclined rela
tive to the longitudinal axis of the cutter.
, c 3. A drill cutter mounted to roll upon the well
bottom, teeth formed on the outer periphery
thereof, said teeth being chisel-shaped with cut
ting crests thereon and formed in rows longitudi
in a zig-zag
of the cut
longitudinal
axis of the
that of the
4._ A well drill including a head, two upwardly
and inwardly inclined side cutters and two in
wardly tapered cross roller cutters mounted
thereon, the teeth on said cross roller cutters 10
being formed in rows longitudinally of the peri
phery thereof, and also in rows circumferentially
about the same,_ said circumferential rows form
ing irregular zig-zag lines, said circumferential
rows being spaced apart by intervening troughs. 15
5. A well drill including a head, two upwardly
and inwardly inclined side cutters and two in
wardly tapered cross roller cutters mounted
thereon, the teeth on said cross roller cutters be
ing formed in rows longitudinally of the peri 20
phery thereof, and also in rows circumferentially
about the same, said circumferential rows being
in zig-zag lines spaced apart ‘ by intervening
troughs, the crests of the teeth being elongated
and chisel-shaped and lying at an angle inclined 25'
from the direction of the said circumferential
row.
6. A wella drill cutter tapered slightly from its
outer end toward itsinner end, rows of teeth on
said cutter extending in wavy‘ rows around the 3D
circumference thereof, the crests of said teeth
being chisel-shaped, the crests of any teeth on
one row lying at a different angle relative to
the cutter axis than the crests on teeth adjacent
thereto in the same or different rows.
FLOYD 'L. soon‘.
3.5
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